Find the next number in the series: 5, 10, 20, 40, ? MCQ with Answer and Explanation

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Find the next number in the series: 5, 10, 20, 40, ?

A. 70

B. 60

C. 80

D. 100

Answer: Option C

Solution (By JKSSB Mock Tests)

Each term is multiplied by 2. 40×2=80.

This question belongs to: Reasoning Logical Reasoning

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Question #1

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In a certain code, '467' means 'leaves are green', '485' means 'green is good', '639' means 'they are playing'. Which digit stands for 'are'?

A. 8

B. 6

C. 7

D. 4

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Correct Answer: Option B

Explanation:
'green' first two =4, 'are' first and third =6.

This question belongs to: Reasoning Logical Reasoning

Question #2

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Statement: No A is B. Some C are A. Conclusions: I. Some C are not B. II. All C are B.

A. Only I follows

B. Both follow

C. Neither follows

D. Only II follows

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Correct Answer: Option A

Explanation:
Some C are A and no A is B, so those C which are A cannot be B. Hence some C are not B.

This question belongs to: Reasoning Logical Reasoning

Question #3

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In a certain code, '256' means 'red is colour', '589' means 'colour is beautiful', '245' means 'red and white'. Which digit stands for 'is'?

A. 8

B. 5

C. 6

D. 2

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Correct Answer: Option B

Explanation:
'colour' first two =5? 'is' common first two =5, 'red' first and third =2, 'colour' =5 or 6/8/9.

This question belongs to: Reasoning Logical Reasoning

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